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Method and implant device for grafting adjacent vertebral bodies




Title: Method and implant device for grafting adjacent vertebral bodies.
Abstract: A methodology for grafting together adjacent bony structures is provided using an implant device having an endplate with an inner disc portion and outer ring portion spaced from the inner disc portion by a connecting wall disposed therebetween. An endplate interior surface includes a retaining structure for securing the endplate to one of the bony structures, and endplate an exterior surface has an integrally formed socket. A ball-joint rod has a longitudinally extending body and an end, and at least a portion of the ball-joint rod end is curvilinear in shape. The curvilinear ball-joint rod end is rotatably disposed in the endplate socket to fixedly interconnect the bony structures. ...


USPTO Applicaton #: #20120330418
Inventors: John A. Cowan


The Patent Description & Claims data below is from USPTO Patent Application 20120330418, Method and implant device for grafting adjacent vertebral bodies.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of and priority to U.S. Provisional Application No. 61/499,271, filed Jun. 21, 2011, which is incorporated herein by reference.

BACKGROUND

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The present disclosure relates generally to a vertebral implant device, and more particularly, to a method and implant device for grafting together adjacent vertebral bodies.

Diseases and injury to bone structures, such as the vertebral column, and conditions requiring surgical intervention are relatively common. A variety of conventional implant or graft devices are presently available for use in specific areas. The devices vary in size, shape, materials used, and insertion techniques. For example, in the vertebral column, grafts may provide restoration, decompression, or stabilization of the spine. Typically these devices include a member that is inserted in the vertebral column to replace an injured portion. An example of such a procedure is a corpectomy, which involves the replacement of a vertebral body with an implant or graft. The graft is secured to the adjacent vertebrae via a plurality of fasteners to maintain the position of the implant in situ.

While these conventional devices may generally provide adequate results, they have several disadvantages. For example, conventional graft devices utilized in a corpectomy procedure typically have a relatively bulky all-in-one construction and include several components. Such an implant construction limits surgery flexibility, including the approach to the spine. The instrument utilized for insertion is likewise limited due to the constraints of existing implant devices.

Thus, there is a need in the art for a graft device that has a modular construction such that components can be interconnected when and as needed to enhance surgery flexibility and offer increased adaptability to individual patent anatomy.

SUMMARY

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Accordingly, the present disclosure relates to an implant device for grafting together adjacent bony structures. The implant device has an endplate with an inner disc portion and outer ring portion spaced from the inner disc portion by a connecting wall disposed therebetween. An endplate interior surface includes a retaining structure for securing the endplate to one of the bony structures, and endplate an exterior surface has an integrally formed socket. A ball-joint rod has a longitudinally extending body and an end, and at least a portion of the ball-joint rod end is curvilinear in shape. The curvilinear ball-joint rod end is rotatably disposed in the endplate socket to fixedly interconnect the bony structures. The methodology includes the steps of securing an endplate to each of the vertebral bodies and interconnecting each endplate using a ball-joint rod.

One advantage of the present disclosure is that an improved implant device is provided that is modular in construction and enhances surgery flexibility allowing for minimally invasive approaches. Another advantage of the present disclosure is that the implant device is a vertebral graft that is easy to assemble and insert from a lateral or lateral extracavity approach. Yet another advantage of the present disclosure is that a vertebral implant device is provided that facilitates bone grafting. Still another advantage of the present disclosure is that the vertebral implant device includes a bristle post to help support bone growth. A further advantage of the present disclosure is that the vertebral implant device provides for strong and stable endplate gripping. Yet a further advantage of the present disclosure is that the vertebral implant device provides for modular in situ insertion for easier placement. Still a further advantage of the present disclosure is that the vertebral implant device provides for larger endplates which results in less “pistoning” and more aggressive distraction for enhanced performance. Still yet a further advantage of the present disclosure is that the vertebral implant device provides a snap-in ball-joint rod that enables variation in endplate alignment and angulation. Still yet another advantage of the present disclosure is that the vertebral implant device may include a snap-on bristle cage that enables generous and stable packing of bone graft. Still another advantage of the present disclosure is that the vertebral implant device provides may include a snap-on allograft strut. Yet another advantage of the present disclosure is that the vertebral implant device provides for motion preservation due to a ball-joint construct.

Other features and advantages of the present disclosure will be readily appreciated, as the same becomes better understood after reading the subsequent description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

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FIG. 1 is a perspective view of a vertebral implant device, according to an exemplary embodiment.

FIG. 2 is a top view of an endplate of the vertebral implant device of FIG. 1.

FIG. 3 is a side view of the endplate of the vertebral implant device of FIG. 2.

FIG. 4 is a side view of the endplate of the vertebral implant device of FIG. 3 including a fastener.

FIG. 5a is an elevational side view of a ball-joint rod of the vertebral implant device of FIG. 1.

FIG. 5b is an elevational side view of a ball-joint rod having a plurality of spikes, according to another embodiment.

FIG. 6 is a perspective view of a vertebral implant device having a bristle post fusion shaft member.

FIG. 7 is an enlarged side view of the bristle post fusion shaft member of FIG. 6.

FIG. 8 is a top view of the ball-joint rod and bristle shaft member of FIG. 6.

FIG. 9 is a perspective view of a vertebral implant device having a ring fusion shaft member.

FIG. 10 is an enlarged side view of the ring fusion shaft member of FIG. 9.

FIG. 11 is a top view of the ball-joint rod of FIG. 9.

FIG. 12 is a perspective view of a device for inserting a vertebral implant into a vertebral region, according to an exemplary embodiment.

FIG. 13 is a flowchart of a method of inserting a vertebral implant device into a vertebral region, using the vertebral implant device of FIG. 1.

FIG. 14 is a side view illustrating a vertebral region having undergone a corpectomy according to the method of FIG. 13.

FIG. 15 is a side view illustrating a pair of endplates inserted between two vertebrae, according to the method of FIG. 13.

FIG. 16 is a side view of the endplates of FIG. 15 illustrating attachment of the endplates to the vertebrae.

FIG. 17 is a side view illustrating attachment of a ball-joint rod to the endplates.

FIG. 18 is a side view of a bristle fusion shaft member attached to the ball-joint rod of FIG. 17, according to an exemplary embodiment.

FIG. 19 is a sectional view of the vertebral implant device of FIG. 6 secured to two to adjacent vertebral bodies.

FIG. 20 is an elevational view of the vertebral implant device set at a predetermined angle.




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Tapered arcuate intervertebral implant
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Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
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stats Patent Info
Application #
US 20120330418 A1
Publish Date
12/27/2012
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0




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Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor   Implantable Prosthesis   Bone   Spine Bone   Having Ball And Socket Means  

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20121227|20120330418|method and implant device for grafting adjacent vertebral bodies|A methodology for grafting together adjacent bony structures is provided using an implant device having an endplate with an inner disc portion and outer ring portion spaced from the inner disc portion by a connecting wall disposed therebetween. An endplate interior surface includes a retaining structure for securing the endplate |